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| TECHNICAL SERVICE BULLETIN 6.7L - Illuminated MIL, Various DTCs And Possible Forced Idle - Built On Or Before 10-Feb-2021 | 21-2248 13 September 2021 | |||||||||||||||
| This bulletin supersedes 21-2055. Reason for update: Incorrect or Incomplete Symptom Model:
This article supersedes TSB 21-2055 to update the Title, Issue, Action, vehicles affected and production fix date. Issue: Some 2020-2021 F-Super Duty vehicles equipped with a 6.7L engine built on or before 10-Feb-2021 may exhibit an illuminated malfunction indicator lamp (MIL) and diagnostic trouble codes (DTCs) P0300-P0308, P0603, P203B, P208B, P208C, P20EE, P2201, P24C2, P27B4 and/or P27B5 stored in the powertrain control module (PCM). The vehicle may also exhibit a forced idle condition. This may be due to various strategies within the PCM software. To correct the condition, follow the Service Procedure to reprogram the PCM. Action: Follow the Service Procedure to correct the condition on vehicles that meet all of the following criteria: Warranty Status: Eligible under provisions of New Vehicle Limited Warranty (NVLW)/Emissions Warranty/Service Part Warranty (SPW)/Special Service Part (SSP)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/Emissions Warranty/SPW/SSP/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool. Labor Times
1. Reprogram the PCM using the latest software level of the appropriate Ford diagnostic scan tool. NOTE: Advise the customer that this vehicle is equipped with an adaptive transmission shift strategy which allows the vehicle's computer to learn the transmission's unique parameters and improve shift quality. When the adaptive strategy is reset, the computer will begin a relearning process. This relearning process may result in firmer than normal upshifts and downshifts for several days. 2. Does the vehicle exhibit a forced idle condition? (1). Yes - proceed to Step 3. (2). No - the repair is complete. 3. Remove the vehicle from forced idle. (1). Allow the vehicle to sit indoors to increase diesel exhaust fluid (DEF) tank temperature to greater than 0°C (32°F). In extreme cold weather, allow the vehicle to sit indoors at least 24 hours with a fan circulating air around the DEF tank to thaw the tank. (2). Start the vehicle and allow it to idle for 10-15 minutes. (3). Drive the vehicle forward at wide open throttle (WOT) for up to 5 minutes. It is very important to not back off the accelerator pedal when trying to get it out of forced idle. If the truck does not come out of forced idle mode after 2 minutes, stop the vehicle and idle for a few minutes before trying again. NOTE: Full power is immediately restored when the vehicle is cleared from forced idle. |
But seriously, low range? Only first gear? That just sounds like trouble driving with a wide open throttle that can’t be let off of for at least 2 minutes straight. Anyone else find that odd?
